Previous Determinations

ANSI/ASHRAE/IES Standard 90.1-2010

On October 19, 2011, DOE issued a Notice of Final Determination that Standard 90.1-2010 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2010 Determination.


ANSI/ASHRAE/IESNA Standard 90.1-2007

On July 20, 2011, DOE issued a Notice of Final Determination that Standard 90.1-2007 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2007 Determination.


ANSI/ASHRAE/IESNA Standard 90.1-2004

On December 30, 2008, DOE issued a Notice of Final Determination that Standard 90.1-2004 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-2004 Determination.


ANSI/ASHRAE/IESNA Standard 90.1-1999

On July 15, 2002, DOE issued a Notice of Final Determination that Standard 90.1-1999 would achieve greater energy efficiency in buildings subject to the code.

Supporting Analysis

A qualitative analysis and quantitative analysis was performed in support of the Standard 90.1-1999 Determination.

2009 IECC

On July 19, 2011, DOE issued a Notice of Final Determination that the 2009 IECC would achieve greater energy efficiency in residential buildings subject to the code.


2006 IECC

On July 19, 2011, DOE issued a Notice of Final Determination that the 2006 IECC would achieve greater energy efficiency in residential buildings subject to the code.